Charles henry roberts



O.H.ROBERT& Grinding Mill.

Patented April 12. 1870.

the outer ends of which agili lllddfifiitt.

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CHARLES HENRY-ROBERTS." or EVANSVILLE, INDIANA.

Letters PatcntNo. 10 1,917, dated April 12, 1870.

1, CHARLES HENRY ROBERTg-of Evansville, county of Vanderburg, State ofIndiana, have invented an ImprovedGrinding-Mill, of which the followingis a specification. Nata-re and Oly'cctof the In'rcntwn.

My' invention consists of a gninding-niill having a cylindrical burrevolving in fixed bearings, anda concave grinding-surface renderedadjustable with the case which cont-ains'the bur, in amanncr which willbe fully described hereafter; and

My invention also consists in the combination of the said adjustablecase,'and a concave consisting-of a'nu'mher of plates or disks havingserrated edges, with irrtervening plates having plain edges, ashereafter explained. l

Description of the Accompanying Drawing,

Figure 1 is a side elevation of my improved grinding-mill Figure 2, avertical section of the same;

Figure 3, a sectional plan .view on the line 1 2, fig.

1; and v 3 Figure 4, a transverse section of part .of the will on theline 3 4, fig. 1.

General Description. A represents a wooden beam or other stationaryobject, to which a frame or plate, B, is secured by bolts,

a,-but it should be understood-that this frame can be so modified inform as to be entirely self-supporting.

The frame B has two arms or brackets, I) and b, at are formed bearings,c c, for the journals of a horizontal shalt, D, which carries adriving-pulley, F, and the cylindrical bur G of themill.

The bur is of the peculiar construction best observed .in fig. 3, as itconsists of a number of thin serrated disks or plates, d, of steel,resembling circular saw blades, which are adjusted upon the shaftalternately with thin disks or plates, at, of sheet-iron, tin, orothersuitable material, these disks being of a somewhat less diameter thanthose with serrated edges.

The whole oftlie platesforming the bur are confined between a collar, e,of the shaft 1), and a washer,

j,- whieh is forced against the said plates by a nut, g, adapted to thethreaded portion 9 of the shaft.

I have found that burs constructed in the above manner are mosteffective in practice, as the teeth of the several plates form acontinuous dress,, which can be readily sharpened when necessary,orwvhieh can be quickly repaired by the removing and replacing of any ofthe plates when the teeth become broken.

The cylindrical bur (J is contained within a cast-iron shell or case H,which consists of side-plates l: h, a

'veitical'guides on the frameB;

top plate, 13, "bottom plate i, and vertical end-piece j,

the whole being secured together by suitable bolts, 16.

A hopper, l, of appropriate capacity, is secured to the top of the caseB, and the opening at the bottom of't-he said hopper is arranged to bewholly or partially closed by a sliding gate, in. I

The concave griudingrsurfi'tee I of the mill is constructed in preciselythe same manner as thecylindri cal bur G, that is, of a number of plainand serrated plates arranged alternately. It is permanently securedwithin the case H by bolts 7c, rests against the end piece j of thesaidcase, and is so arranged in respect to the cylindrical bur G thatthe space between it and the latter shall gradually decrease in widthtoward the bottom. I

' The case B so attached to the frame-B that it can, together with theconcave, be adjusted vertically,

while the shaft 1) and cylindrical bar, which are carried by the frameB, remain stationary. The. concave can thus be adjusted toward or fromthe cylindrical bur.

The niethod of connecting and of adjusting thcsaid case is, in thepresent instance, as follows:

The frame Bhas at the top two vertically-slotted lugs, 11 p, and at thebottom a vertical slot, 1), and to these slots are adapted the bolts qand q of the case, furnished with suitable nuts, which, after a verticaladjustment of the case, can be tightened, sons to retain the. latter inany desired position.

The adjustment is effected by means of a set-screw, 1r, which passesthrough a threaded projection, r, on the case, and bears upon the top ofthe frame B, so

' that, after loosening the nuts of the bolts q and q, the

said case can be raised or lowered and the concave bur I correspondinglyadjusted,,to the greatest nicet-y, by simply turning the set-screw 0'.

Thus the mill can be qniokl y and accurately adjusted for either fineoncoa'rse grinding. and is, therefore, particularlarly applicable forfarmers use, for grinding cornand other grain into meal of variousdegrees of fineness.

The bolts 'q and q may in some cases be altogether dispensedwith, andthe case be inade adjustable in but I prefer to use these bolts, as theyenable the case and frame to be rigidly connected together after roachadjustment of the parts.

When the mill is'. inoperation the feeding of the grain into the spacebetween the bur and concave is regulated by the gate in in the bottom ofthe be )per, and the meal passes from the outlet or spou to the caseinto any suitable receptacle.

In constructing the mill it is neccssar y 1 order to permit theabove-described vertical adjustment of the case, that the openings inthe side plates I; h of-'the same should be elongated or made ofsomewhat great-ten diameter then the portion of theshaft D, which passesthrough them; but as these opening are situated at one side of and abovethe space betweenthe bur and eoncnve, there islittle or no tendency ofthe grounder partly-ground 'mate ial'to'eseape througl 'l them.

1; The combination of abur revolving in fixed hen'rings, an adjustablecase inelo'sing the bur'," aud a eoncave secured to the case, allsubstantially as described.

thisspeoification in the 2. The ease H, eontaininga concave, I, andadjust able on a frame, B, substantially as described.

v 3. The combination of the adjustable case H and a concave consistingof plain and serrated plates, arranged as set forth. Iu testimonvwhereof I have signed my name to witnesses. v

, CHARLES HENRY ROBERTS. Witnesses: 4

' THOMAS ROBERTS,

ASTLEY COOPER ANGOXA.

presence of two subscribing,

